Electric switch



' J. F. PRESE.

ELECTRIC swncn Feb. 8, 1949.

Original Filed April 27, 1944 '3 Sheets-She-et 1 J. F. FRI-:SE 2,460,819

ELECTRIC SWITCH Feb. 8, 1949.

3 Sheets-Sheet 2 y(Drigfmal Filed April 27, 1944 Feb. 8', 1949. .1. F. FREsE ELECTRIC SWITCH .'5 Sheets-Sheet 3 originall Filed Apri; 27, i944 Patcnted Feb. 8. l1949 ELECTRIC SWITCH Joseph F. Frese, Baltimore, Md., aaalgnor to The Monitor Controller Company, Baltimore, Md., a corporation of Maryland Original application April 27,1944, Serial No.

533,010. Divided and this application June 5, 1945, Serial No. 597,868

(Cl. 20o-166) Claims.

My inventionrelates broadly to electrical switches and more particularly to an automaticaily operated electric switch system.`

This application is a division of my application Serial Number 533,010 filed April 27, 1944, for Automatic electric switch and contactor system.

One of the objects of my inventionis to provide a high potential automatic switch system including insulators for mounting angularly movable arms having contactors thereon in combination with mechanism for moving the arms in clockwise and counterclockwise direction for making and breaking connection with stationary contacts insulatedly mounted in alignment with the switch arms.

Another object of my invention is to provide an improved construction of mounting means for the switch arms of a high potential switch system.

A further object of my invention is to provide an improved construction of mounting means for interlocking a switch arm with a rod-like insulator for angularly controlling the movement oi a high potential switch arm.

Other and further objects of my invention reside in the construction and arrangement of parts of the automatic switch as set forth in the accompanying specification and shown in the accompanying drawings in which Figure 1 is a plan view of the automatic switch system and actuator therefor embodying the switch mounting means of my invention; Fig. 2 is a side view of the automatic switch system and actuator and showing the switch arm mounting means of my invention; Fig. 3 is a view illustrating the arrangement of auxiliary contacts in association with one of the switch arms and illustrating the automatic drive control mechanism in plan view with parts broken away and shown in section; Fig. 4 is a plan view showing one of the switch arms carried by the insulator; Fig. 5 is an end viewfof the hardware which supports the switch arm with respect to the insulator; Fig. 6 is a cross-sectional view through the hardware and insulator vslmwing the support of the switch arm thereby; and Fig. 7 is a transverse sectional view taken on line 'i-l of Fig. 3 illustrating the stationarycontact which is carried by an insulator mounted on the apparatus panel.

Referring to the drawings in detail reference 2 is shown more particularly in Figs. 4, 5 and 6 wherein it will be seen that the hardware S and 4 are recessed as indicated at i to fit over the metallic cap member 8 which is secured by a suitable coating of cement or metallic layer indicated at 9 to the end of the insulator. 'I'he cap 8 has a projection iii thereon which is centrally recessed and screw-threaded at li to receive the screw-threaded member i2 which forms the connection means for the flexible cable ll constituting the electrical connection for the switch arm. Set screws I3 extend through threaded apertures in the hardware 3 and 4 and engage the projecting end of the metallic cap at i0 for firmly securing the switch arm in position with respect to the insulator 5. The hardware iittings I and 4 contain arcuate shaped lipped portion i5 through which a set screw I6 may extend for locking the hexagonal head iii of the screw-threaded terminal member I2 of the flexible cable it for insuring firm position of the 'switch arm with respect to the insulator 5. The switch arms carry at their ends spring contact members which I have illustrated at I8 and I9 shaped to present ilat parallel faces to the coacting jaws of the fixed contacts and which are secured to opposite portions of the `switch arm. The faces of contacts I8 `and i9 are silvered to insure good conductivity under conditions of arcing when establishing connection with the coacting faces of the coacting switch jaws. The switch arm is slotted throughout a portion of its length as represented at 2U to impart suilicient resiliency to the contact members I 8 and i9 and thus insure good electrical contact when the contact members I8 and i9 engage between the laws 20 and 2| of the fixed contactor represented at 22. Conditions of vibration are thereby .prevented from displacing or disturbing the contact so thatthe switch system is applicable in any plac subject to vibration. The opposite jaws 20 and 2i have their interior faces coated with a silver lining 20a and 2la to increase conductivity. The, means for securing hardware 22 constituting the stationary contact with respect to the insulator are identical with the means for securing the hardware 3 and I constituting the support for the movable contactor or switch arm in order to facilitate production and reduce manufacturing and maintenance y costs. The number of replacement parts may thereby be maintained at a minimum. Electrical connection is established with the fixed contact many suitable manner such as the method explained in connection with 'the mov- Vunderstood that the other arm is constructed in a similar manner and that corresponding reference characters indicate similar parts. I have illustrated my invention applied to a two-pole single throw switch, but it will be fully understood that the construction may be applied to a double throw system or multiple contact arrangement.

The insulators and 6 are movable with respect to a panel represented at 24 which provides mounting means for the automatic switch operating mechanism, the auxiliary contact system,

the driving motor and the motor control mechanr ism.

Stationary contactor 22-carried by insulator 39 is mounted directly upon the panel by the socket base 25. Socket base 25 is suitably secured by ange bolts 26 to panel 24. Insulator 5 is secured in a socket member 21 which is secured in any y suitable manner to the iiange member 28 carried by the shaft 29. Shaft 29 is journaled in sleeve bearing 30. The sleeve bearing 30 is oilless and does not require lubrication. It is supported in engageable with the recessed end of said metallic cap member. a iiexible conductor extending into said headed plug, a metallic fitting embracing said metallic cap member, an electric switch arm ycarried by said metallic iitting, an arcuate-shaped lip portionjormed on said metallic fitting and extending in spacial 'relation to the headed end of said screw-threaded plug and means extending through said arcuate-shaped lip portion and engaging the headed end of said screw-threaded plug for interlocking said plug and metallic I fitting.

3. An'electric switch comprising an axially rotatable rod-like member formed from insulation material, a metallic cap member having a recess therein engageable over the end of said rod-like member, a screw-threaded recess in said metallic c ap member and a screw-threaded headed plug engageable with the recessed end of said metallic cap member, a flexible conductor extending into said headedvplug, a metallic tting embracing said cap member, an electric switch arm carried by said metallic fitting, a shoulder projecting from said metallic -iitting, a screw member passhousing 3l which forms part of the base casting 32 secured to the panel by through bolts represented at 33.v The sleeve bearing extends the I full length of the housing 3| which terminates in a position forming an abutment for the hub portion 32 of the drum 34. Drum 34 has two peripheral grooves `35 and 36 within which the driving bands 31 and 38 operate.

While I have described my invention in one of its preferred embodiments, I realize that modications may be made in the details land arrangement of the switch system and I desire thatit be understood that my invention is not limited to the particular structures shown but may be changed as to detail within the scope of the appended claims.

What I claim and desire to secure by Letters Patent of the United States is as follows:

1. An electric switch comprising an axially rotatable rod-like member formed from insulation material, a metallic cap member having a recess therein engageable over the end of said rod-like member, a screw-threaded recess in said metallic cap member, a screw-threaded headed plug having a flexible electrical conductor connected Y therewith, said screw-threaded plug being engageable in the screw threads in the recessed end of said metallic cap member, a metallic tting embracing said metallic, cap member, a switch material, a metallic cap member having a recess therein engageable over the end of said rod-like member, a screw-threaded recess in said metallic cap member and a screw-threaded headed plug like member.

ing through said shoulder and engaging the headed end of said screw-threaded plug and interlocking said metallic fitting with said cap member.

4. An electric switch comprising an axially rotatable rod-like member formed from insulation material, a metallic cap member having a recess therein engageable over the end of said rod-like member, a screw-threaded recess in said metallic cap member and a rscrewthreaded headed plug engageable with the recessed end of said metallic cap member, a exible conductor extending into said headed plug, a metallic fitting embracing said cap member, an electric switch arm carried by said metallic fitting, a shoulder projecting from said metallic fitting oiset from said axially' rotatable rod-like member, and a screw member screw-threaded through said shoulder and abutting against the headed end of said screwthreaded plug for interlocking said metallic fitting with respect to said axially rotatable rod- 5. An electric switch comprising an axially rotatable rod-like member formed from insulation material, a metallic cap member having a recess therein kengageable over the endl of said rod-like member, a screw-threaded. recess in said metallic cap member and a screw-threaded headed plug engageable with the recessed end of said metallic cap member, a iiexible conductor extending into said headed plug, a metallic tting embracing said cap member, a radially extending switch arm carriedby said metallic tting, a curved wall-like projection integrally connected with said metallic respect to said axially rotatable rod-like-member.

JOSEPH F. FRESE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Date 

